From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 30A6B3858C2F; Thu, 15 Jun 2023 05:38:14 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 30A6B3858C2F
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1686807494;
	bh=OrjWKcDlkoQvWf/9wVEjtiTkj4cqWL8zCFoPGAweyRc=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=MXa1Z0FDaoz0YSLEkuZCg0fk69EZlB1nZPtih8Was41P4egNnN58PcigKe1icQOm6
	 dO6vrCpBldPbwUptuA13RiNwYX3XLt3Uy19XxCHhuYzdC7I0/gd52PiWNNj3sOZfHr
	 bN4J5OHrHL79p3Z8Y1EB1sHQM/R8HLUWm+VL35H8=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/110233] [12/13/14 Regression] Wrong code at -Os on
 x86_64-linux-gnu
Date: Thu, 15 Jun 2023 05:38:13 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.4
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cf_known_to_work cf_known_to_fail keywords
Message-ID: <bug-110233-4-VSMl5bzQAc@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110233-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110233-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110233

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |5.3.0, 5.5.0
      Known to fail|                            |5.2.0
           Keywords|needs-bisection             |

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Oh never mind, the problem is IV-OPTS introducing the overflow.
before IVOPTs we have:
  _1 =3D b.6_9 + -1691021644;
  _2 =3D _1 + b.6_9;
  _3 =3D _2 + -1691021636;
  _4 =3D _3 + g_13;
Which does not have any overflow ...

But afterwards we have one:
  _28 =3D b.6_9 * 2;
...

that was broken even in GCC 4.7 and most likely earlier.
I had missed that.=